﻿//#define USE_SharpZipLib
#if !UNITY_WEBPLAYER
#define USE_FileIO
#endif
/* * * * *
 * A simple JSON Parser / builder
 * ------------------------------
 * 
 * It mainly has been written as a simple JSON parser. It can build a JSON string
 * from the node-tree, or generate a node tree from any valid JSON string.
 * 
 * If you want to use compression when saving to file / stream / B64 you have to include
 * SharpZipLib ( http://www.icsharpcode.net/opensource/sharpziplib/ ) in your project and
 * define "USE_SharpZipLib" at the top of the file
 * 
 * Written by Bunny83 
 * 2012-06-09
 * 
 *
 * Features / attributes:
 * - provides strongly typed node classes and lists / dictionaries
 * - provides easy access to class members / array items / data values
 * - the parser now properly identifies types. So generating JSON with this framework should work.
 * - only double quotes (") are used for quoting strings.
 * - provides "casting" properties to easily convert to / from those types:
 *   int / float / double / bool
 * - provides a common interface for each node so no explicit casting is required.
 * - the parser tries to avoid errors, but if malformed JSON is parsed the result is more or less undefined
 * - It can serialize/deserialize a node tree into/from an experimental compact binary format. It might
 *   be handy if you want to store things in a file and don't want it to be easily modifiable
 * 
 * 
 * 2012-12-17 Update:
 * - Added internal JSONLazyCreator class which simplifies the construction of a JSON tree
 *   Now you can simple reference any item that doesn't exist yet and it will return a JSONLazyCreator
 *   The class determines the required type by it's further use, creates the type and removes itself.
 * - Added binary serialization / deserialization.
 * - Added support for BZip2 zipped binary format. Requires the SharpZipLib ( http://www.icsharpcode.net/opensource/sharpziplib/ )
 *   The usage of the SharpZipLib library can be disabled by removing or commenting out the USE_SharpZipLib define at the top
 * - The serializer uses different types when it comes to store the values. Since my data values
 *   are all of type string, the serializer will "try" which format fits best. The order is: int, float, double, bool, string.
 *   It's not the most efficient way but for a moderate amount of data it should work on all platforms.
 * 
 * 2017-03-08 Update:
 * - Optimised parsing by using a StringBuilder for token. This prevents performance issues when large
 *   string data fields are contained in the json data.
 * - Finally refactored the badly named JSONClass into JSONObject.
 * - Replaced the old JSONData class by distict typed classes ( JSONString, JSONNumber, JSONBool, JSONNull ) this
 *   allows to propertly convert the node tree back to json without type information loss. The actual value
 *   parsing now happens at parsing time and not when you actually access one of the casting properties.
 * 
 * The MIT License (MIT)
 * 
 * Copyright (c) 2012-2017 Markus Göbel
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 * 
 * * * * */
using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using NFinal.Collections;

namespace SimpleJSON
{
    public enum JSONNodeType
    {
        Array = 1,
        Object = 2,
        String = 3,
        Number = 4,
        NullValue = 5,
        Boolean = 6,
        None = 7,
    }

    public abstract partial class JSONNode
    {
        #region common interface

        public virtual JSONNode this[int aIndex] { get { return null; } set { } }

        public virtual JSONNode this[string aKey] { get { return null; } set { } }

        public virtual string Value { get { return ""; } set { } }

        public virtual int Count { get { return 0; } }

        public virtual bool IsNumber { get { return false; } }
        public virtual bool IsString { get { return false; } }
        public virtual bool IsBoolean { get { return false; } }
        public virtual bool IsNull { get { return false; } }
        public virtual bool IsArray { get { return false; } }
        public virtual bool IsObject { get { return false; } }

        public virtual void Add(string aKey, JSONNode aItem)
        {
        }
        public virtual void Add(JSONNode aItem)
        {
            Add("", aItem);
        }

        public virtual JSONNode Remove(string aKey)
        {
            return null;
        }

        public virtual JSONNode Remove(int aIndex)
        {
            return null;
        }

        public virtual JSONNode Remove(JSONNode aNode)
        {
            return aNode;
        }

        public virtual IEnumerable<JSONNode> Children
        {
            get
            {
                yield break;
            }
        }

        public IEnumerable<JSONNode> DeepChildren
        {
            get
            {
                foreach (var C in Children)
                    foreach (var D in C.DeepChildren)
                        yield return D;
            }
        }

        public override string ToString()
        {
            return "JSONNode";
        }

        public virtual string ToString(string aIndent)
        {
            return ToString(aIndent, "");
        }

        internal abstract string ToString(string aIndent, string aPrefix);

        #endregion common interface

        #region typecasting properties

        public abstract JSONNodeType Tag { get; }

        public virtual double AsDouble
        {
            get
            {
                double v = 0.0;
                if (double.TryParse(Value, out v))
                    return v;
                return 0.0;
            }
            set
            {
                Value = value.ToString();
            }
        }

        public virtual int AsInt
        {
            get { return (int)AsDouble; }
            set { AsDouble = value; }
        }

        public virtual float AsFloat
        {
            get { return (float)AsDouble; }
            set { AsDouble = value; }
        }

        public virtual bool AsBool
        {
            get
            {
                bool v = false;
                if (bool.TryParse(Value, out v))
                    return v;
                return !string.IsNullOrEmpty(Value);
            }
            set
            {
                Value = (value) ? "true" : "false";
            }
        }

        public virtual JSONArray AsArray
        {
            get
            {
                return this as JSONArray;
            }
        }

        public virtual JSONObject AsObject
        {
            get
            {
                return this as JSONObject;
            }
        }


        #endregion typecasting properties

        #region operators

        public static implicit operator JSONNode(string s)
        {
            return new JSONString(s);
        }
        public static implicit operator string(JSONNode d)
        {
            return (d == null) ? null : d.Value;
        }

        public static implicit operator JSONNode(double n)
        {
            return new JSONNumber(n);
        }
        public static implicit operator double(JSONNode d)
        {
            return (d == null) ? 0 : d.AsDouble;
        }

        public static implicit operator JSONNode(float n)
        {
            return new JSONNumber(n);
        }
        public static implicit operator float(JSONNode d)
        {
            return (d == null) ? 0 : d.AsFloat;
        }

        public static implicit operator JSONNode(int n)
        {
            return new JSONNumber(n);
        }
        public static implicit operator int(JSONNode d)
        {
            return (d == null) ? 0 : d.AsInt;
        }

        public static implicit operator JSONNode(bool b)
        {
            return new JSONBool(b);
        }
        public static implicit operator bool(JSONNode d)
        {
            return (d == null) ? false : d.AsBool;
        }

        public static bool operator ==(JSONNode a, object b)
        {
            if (ReferenceEquals(a, b))
                return true;
            bool aIsNull = a is JSONNull || ReferenceEquals(a, null) || a is JSONLazyCreator;
            bool bIsNull = b is JSONNull || ReferenceEquals(b, null) || b is JSONLazyCreator;
            return (aIsNull && bIsNull);
        }

        public static bool operator !=(JSONNode a, object b)
        {
            return !(a == b);
        }

        public override bool Equals(object obj)
        {
            return System.Object.ReferenceEquals(this, obj);
        }

        public override int GetHashCode()
        {
            return base.GetHashCode();
        }

        #endregion operators
        internal static StringBuilder m_EscapeBuilder = new StringBuilder();
        internal static string Escape(string aText)
        {
            m_EscapeBuilder.Length = 0;
            if (m_EscapeBuilder.Capacity < aText.Length + aText.Length / 10)
                m_EscapeBuilder.Capacity = aText.Length + aText.Length / 10;
            foreach (char c in aText)
            {
                switch (c)
                {
                    case '\\':
                        m_EscapeBuilder.Append("\\\\");
                        break;
                    case '\"':
                        m_EscapeBuilder.Append("\\\"");
                        break;
                    case '\n':
                        m_EscapeBuilder.Append("\\n");
                        break;
                    case '\r':
                        m_EscapeBuilder.Append("\\r");
                        break;
                    case '\t':
                        m_EscapeBuilder.Append("\\t");
                        break;
                    case '\b':
                        m_EscapeBuilder.Append("\\b");
                        break;
                    case '\f':
                        m_EscapeBuilder.Append("\\f");
                        break;
                    default:
                        m_EscapeBuilder.Append(c);
                        break;
                }
            }
            string result = m_EscapeBuilder.ToString();
            m_EscapeBuilder.Length = 0;
            return result;
        }

        static void ParseElement(JSONNode ctx, string token, string tokenName, bool quoted)
        {
            if (quoted)
            {
                ctx.Add(tokenName, token);
                return;
            }
            string tmp = token.ToLower();
            if (tmp == "false" || tmp == "true")
                ctx.Add(tokenName, tmp == "true");
            else if (tmp == "null")
                ctx.Add(tokenName, null);
            else
            {
                double val;
                if (double.TryParse(token, out val))
                    ctx.Add(tokenName, val);
                else
                    ctx.Add(tokenName, token);
            }
        }

        public static JSONNode Parse(string aJSON)
        {
            Stack<JSONNode> stack = new Stack<JSONNode>();
            JSONNode ctx = null;
            int i = 0;
            StringBuilder Token = new StringBuilder();
            string TokenName = "";
            bool QuoteMode = false;
            bool TokenIsQuoted = false;
            while (i < aJSON.Length)
            {
                switch (aJSON[i])
                {
                    case '{':
                        if (QuoteMode)
                        {
                            Token.Append(aJSON[i]);
                            break;
                        }
                        stack.Push(new JSONObject());
                        if (ctx != null)
                        {
                            ctx.Add(TokenName, stack.Peek());
                        }
                        TokenName = "";
                        Token.Length = 0;
                        ctx = stack.Peek();
                        break;

                    case '[':
                        if (QuoteMode)
                        {
                            Token.Append(aJSON[i]);
                            break;
                        }

                        stack.Push(new JSONArray());
                        if (ctx != null)
                        {
                            ctx.Add(TokenName, stack.Peek());
                        }
                        TokenName = "";
                        Token.Length = 0;
                        ctx = stack.Peek();
                        break;

                    case '}':
                    case ']':
                        if (QuoteMode)
                        {

                            Token.Append(aJSON[i]);
                            break;
                        }
                        if (stack.Count == 0)
                            throw new Exception("JSON Parse: Too many closing brackets");

                        stack.Pop();
                        if (Token.Length > 0)
                        {
                            ParseElement(ctx, Token.ToString(), TokenName, TokenIsQuoted);
                            TokenIsQuoted = false;
                        }
                        TokenName = "";
                        Token.Length = 0;
                        if (stack.Count > 0)
                            ctx = stack.Peek();
                        break;

                    case ':':
                        if (QuoteMode)
                        {
                            Token.Append(aJSON[i]);
                            break;
                        }
                        TokenName = Token.ToString().Trim();
                        Token.Length = 0;
                        TokenIsQuoted = false;
                        break;

                    case '"':
                        QuoteMode ^= true;
                        TokenIsQuoted |= QuoteMode;
                        break;

                    case ',':
                        if (QuoteMode)
                        {
                            Token.Append(aJSON[i]);
                            break;
                        }
                        if (Token.Length > 0)
                        {
                            ParseElement(ctx, Token.ToString(), TokenName, TokenIsQuoted);
                            TokenIsQuoted = false;
                        }
                        TokenName = "";
                        Token.Length = 0;
                        TokenIsQuoted = false;
                        break;

                    case '\r':
                    case '\n':
                        break;

                    case ' ':
                    case '\t':
                        if (QuoteMode)
                            Token.Append(aJSON[i]);
                        break;

                    case '\\':
                        ++i;
                        if (QuoteMode)
                        {
                            char C = aJSON[i];
                            switch (C)
                            {
                                case 't':
                                    Token.Append('\t');
                                    break;
                                case 'r':
                                    Token.Append('\r');
                                    break;
                                case 'n':
                                    Token.Append('\n');
                                    break;
                                case 'b':
                                    Token.Append('\b');
                                    break;
                                case 'f':
                                    Token.Append('\f');
                                    break;
                                case 'u':
                                    {
                                        string s = aJSON.Substring(i + 1, 4);
                                        Token.Append((char)int.Parse(
                                            s,
                                            System.Globalization.NumberStyles.AllowHexSpecifier));
                                        i += 4;
                                        break;
                                    }
                                default:
                                    Token.Append(C);
                                    break;
                            }
                        }
                        break;

                    default:
                        Token.Append(aJSON[i]);
                        break;
                }
                ++i;
            }
            if (QuoteMode)
            {
                throw new Exception("JSON Parse: Quotation marks seems to be messed up.");
            }
            return ctx;
        }

        public virtual void Serialize(System.IO.BinaryWriter aWriter)
        {
        }

        public void SaveToStream(System.IO.Stream aData)
        {
            var W = new System.IO.BinaryWriter(aData);
            Serialize(W);
        }

#if USE_SharpZipLib
		public void SaveToCompressedStream(System.IO.Stream aData)
		{
			using (var gzipOut = new ICSharpCode.SharpZipLib.BZip2.BZip2OutputStream(aData))
			{
				gzipOut.IsStreamOwner = false;
				SaveToStream(gzipOut);
				gzipOut.Close();
			}
		}

		public void SaveToCompressedFile(string aFileName)
		{
		
#if USE_FileIO
			System.IO.Directory.CreateDirectory((new System.IO.FileInfo(aFileName)).Directory.FullName);
			using(var F = System.IO.File.OpenWrite(aFileName))
			{
				SaveToCompressedStream(F);
			}
		
#else
			throw new Exception("Can't use File IO stuff in the webplayer");
#endif
		}
		public string SaveToCompressedBase64()
		{
			using (var stream = new System.IO.MemoryStream())
			{
				SaveToCompressedStream(stream);
				stream.Position = 0;
				return System.Convert.ToBase64String(stream.ToArray());
			}
		}
		
#else
        public void SaveToCompressedStream(System.IO.Stream aData)
        {
            throw new Exception("Can't use compressed functions. You need include the SharpZipLib and uncomment the define at the top of SimpleJSON");
        }

        public void SaveToCompressedFile(string aFileName)
        {
            throw new Exception("Can't use compressed functions. You need include the SharpZipLib and uncomment the define at the top of SimpleJSON");
        }

        public string SaveToCompressedBase64()
        {
            throw new Exception("Can't use compressed functions. You need include the SharpZipLib and uncomment the define at the top of SimpleJSON");
        }
#endif

        public void SaveToFile(string aFileName)
        {
#if USE_FileIO
            System.IO.Directory.CreateDirectory((new System.IO.FileInfo(aFileName)).Directory.FullName);
            using (var F = System.IO.File.OpenWrite(aFileName))
            {
                SaveToStream(F);
            }
#else
			throw new Exception ("Can't use File IO stuff in the webplayer");
#endif
        }

        public string SaveToBase64()
        {
            using (var stream = new System.IO.MemoryStream())
            {
                SaveToStream(stream);
                stream.Position = 0;
                return System.Convert.ToBase64String(stream.ToArray());
            }
        }

        public static JSONNode Deserialize(System.IO.BinaryReader aReader)
        {
            JSONNodeType type = (JSONNodeType)aReader.ReadByte();
            switch (type)
            {
                case JSONNodeType.Array:
                    {
                        int count = aReader.ReadInt32();
                        JSONArray tmp = new JSONArray();
                        for (int i = 0; i < count; i++)
                            tmp.Add(Deserialize(aReader));
                        return tmp;
                    }
                case JSONNodeType.Object:
                    {
                        int count = aReader.ReadInt32();
                        JSONObject tmp = new JSONObject();
                        for (int i = 0; i < count; i++)
                        {
                            string key = aReader.ReadString();
                            var val = Deserialize(aReader);
                            tmp.Add(key, val);
                        }
                        return tmp;
                    }
                case JSONNodeType.String:
                    {
                        return new JSONString(aReader.ReadString());
                    }
                case JSONNodeType.Number:
                    {
                        return new JSONNumber(aReader.ReadDouble());
                    }
                case JSONNodeType.Boolean:
                    {
                        return new JSONBool(aReader.ReadBoolean());
                    }
                case JSONNodeType.NullValue:
                    {
                        return new JSONNull();
                    }
                default:
                    {
                        throw new Exception("Error deserializing JSON. Unknown tag: " + type);
                    }
            }
        }

#if USE_SharpZipLib
		public static JSONNode LoadFromCompressedStream(System.IO.Stream aData)
		{
			var zin = new ICSharpCode.SharpZipLib.BZip2.BZip2InputStream(aData);
			return LoadFromStream(zin);
		}
		public static JSONNode LoadFromCompressedFile(string aFileName)
		{
#if USE_FileIO
			using(var F = System.IO.File.OpenRead(aFileName))
			{
				return LoadFromCompressedStream(F);
			}
#else
			throw new Exception("Can't use File IO stuff in the webplayer");
#endif
		}
		public static JSONNode LoadFromCompressedBase64(string aBase64)
		{
			var tmp = System.Convert.FromBase64String(aBase64);
			var stream = new System.IO.MemoryStream(tmp);
			stream.Position = 0;
			return LoadFromCompressedStream(stream);
		}
#else
        public static JSONNode LoadFromCompressedFile(string aFileName)
        {
            throw new Exception("Can't use compressed functions. You need include the SharpZipLib and uncomment the define at the top of SimpleJSON");
        }

        public static JSONNode LoadFromCompressedStream(System.IO.Stream aData)
        {
            throw new Exception("Can't use compressed functions. You need include the SharpZipLib and uncomment the define at the top of SimpleJSON");
        }

        public static JSONNode LoadFromCompressedBase64(string aBase64)
        {
            throw new Exception("Can't use compressed functions. You need include the SharpZipLib and uncomment the define at the top of SimpleJSON");
        }
#endif

        public static JSONNode LoadFromStream(System.IO.Stream aData)
        {
            using (var R = new System.IO.BinaryReader(aData))
            {
                return Deserialize(R);
            }
        }

        public static JSONNode LoadFromFile(string aFileName)
        {
#if USE_FileIO
            using (var F = System.IO.File.OpenRead(aFileName))
            {
                return LoadFromStream(F);
            }
#else
			throw new Exception ("Can't use File IO stuff in the webplayer");
#endif
        }

        public static JSONNode LoadFromBase64(string aBase64)
        {
            var tmp = System.Convert.FromBase64String(aBase64);
            var stream = new System.IO.MemoryStream(tmp);
            stream.Position = 0;
            return LoadFromStream(stream);
        }
    }
    // End of JSONNode

    public class JSONArray : JSONNode, IEnumerable
    {
        private List<JSONNode> m_List = new List<JSONNode>();

        public override JSONNodeType Tag { get { return JSONNodeType.Array; } }
        public override bool IsArray { get { return true; } }



        public override JSONNode this[int aIndex]
        {
            get
            {
                if (aIndex < 0 || aIndex >= m_List.Count)
                    return new JSONLazyCreator(this);
                return m_List[aIndex];
            }
            set
            {
                if (value == null)
                    value = new JSONNull();
                if (aIndex < 0 || aIndex >= m_List.Count)
                    m_List.Add(value);
                else
                    m_List[aIndex] = value;
            }
        }

        public override JSONNode this[string aKey]
        {
            get { return new JSONLazyCreator(this); }
            set
            {
                if (value == null)
                    value = new JSONNull();
                m_List.Add(value);
            }
        }

        public override int Count
        {
            get { return m_List.Count; }
        }

        public override void Add(string aKey, JSONNode aItem)
        {
            if (aItem == null)
                aItem = new JSONNull();
            m_List.Add(aItem);
        }

        public override JSONNode Remove(int aIndex)
        {
            if (aIndex < 0 || aIndex >= m_List.Count)
                return null;
            JSONNode tmp = m_List[aIndex];
            m_List.RemoveAt(aIndex);
            return tmp;
        }

        public override JSONNode Remove(JSONNode aNode)
        {
            m_List.Remove(aNode);
            return aNode;
        }

        public override IEnumerable<JSONNode> Children
        {
            get
            {
                foreach (JSONNode N in m_List)
                    yield return N;
            }
        }

        public IEnumerator GetEnumerator()
        {
            foreach (JSONNode N in m_List)
                yield return N;
        }

        public override string ToString()
        {
            string result = "[ ";
            foreach (JSONNode N in m_List)
            {
                if (result.Length > 2)
                    result += ", ";
                result += N.ToString();
            }
            result += " ]";
            return result;
        }

        internal override string ToString(string aIndent, string aPrefix)
        {
            string result = "[ ";
            foreach (JSONNode N in m_List)
            {
                if (result.Length > 3)
                    result += ", ";
                result += "\n" + aPrefix + aIndent + N.ToString(aIndent, aPrefix + aIndent);
            }
            result += "\n" + aPrefix + "]";
            return result;
        }

        public override void Serialize(System.IO.BinaryWriter aWriter)
        {
            aWriter.Write((byte)JSONNodeType.Array);
            aWriter.Write(m_List.Count);
            for (int i = 0; i < m_List.Count; i++)
            {
                m_List[i].Serialize(aWriter);
            }
        }
    }
    // End of JSONArray

    public class JSONObject : JSONNode, IEnumerable
    {
        private FastDictionary<string, JSONNode> m_Dict = new FastDictionary<string, JSONNode>();

        public override JSONNodeType Tag { get { return JSONNodeType.Object; } }
        public override bool IsObject { get { return true; } }


        public override JSONNode this[string aKey]
        {
            get
            {
                if (m_Dict.ContainsKey(aKey))
                    return m_Dict[aKey];
                else
                    return new JSONLazyCreator(this, aKey);
            }
            set
            {
                if (value == null)
                    value = new JSONNull();
                if (m_Dict.ContainsKey(aKey))
                    m_Dict[aKey] = value;
                else
                    m_Dict.Add(aKey, value);
            }
        }

        public override JSONNode this[int aIndex]
        {
            get
            {
                if (aIndex < 0 || aIndex >= m_Dict.Count)
                    return null;
                return m_Dict.ElementAt(aIndex).Value;
            }
            set
            {
                if (value == null)
                    value = new JSONNull();
                if (aIndex < 0 || aIndex >= m_Dict.Count)
                    return;
                string key = m_Dict.ElementAt(aIndex).Key;
                m_Dict[key] = value;
            }
        }

        public override int Count
        {
            get { return m_Dict.Count; }
        }

        public override void Add(string aKey, JSONNode aItem)
        {
            if (aItem == null)
                aItem = new JSONNull();

            if (!string.IsNullOrEmpty(aKey))
            {
                if (m_Dict.ContainsKey(aKey))
                    m_Dict[aKey] = aItem;
                else
                    m_Dict.Add(aKey, aItem);
            }
            else
                m_Dict.Add(Guid.NewGuid().ToString(), aItem);
        }

        public override JSONNode Remove(string aKey)
        {
            if (!m_Dict.ContainsKey(aKey))
                return null;
            JSONNode tmp = m_Dict[aKey];
            m_Dict.Remove(aKey);
            return tmp;
        }

        public override JSONNode Remove(int aIndex)
        {
            if (aIndex < 0 || aIndex >= m_Dict.Count)
                return null;
            var item = m_Dict.ElementAt(aIndex);
            m_Dict.Remove(item.Key);
            return item.Value;
        }

        public override JSONNode Remove(JSONNode aNode)
        {
            try
            {
                var item = m_Dict.Where(k => k.Value == aNode).First();
                m_Dict.Remove(item.Key);
                return aNode;
            }
            catch
            {
                return null;
            }
        }

        public override IEnumerable<JSONNode> Children
        {
            get
            {
                foreach (KeyValuePair<string, JSONNode> N in m_Dict)
                    yield return N.Value;
            }
        }

        public IEnumerator GetEnumerator()
        {
            foreach (KeyValuePair<string, JSONNode> N in m_Dict)
                yield return N;
        }

        public override string ToString()
        {
            string result = "{";
            foreach (KeyValuePair<string, JSONNode> N in m_Dict)
            {
                if (result.Length > 2)
                    result += ", ";
                result += "\"" + Escape(N.Key) + "\":" + N.Value.ToString();
            }
            result += "}";
            return result;
        }

        internal override string ToString(string aIndent, string aPrefix)
        {
            string result = "{ ";
            foreach (KeyValuePair<string, JSONNode> N in m_Dict)
            {
                if (result.Length > 3)
                    result += ", ";
                result += "\n" + aPrefix + aIndent + "\"" + Escape(N.Key) + "\" : ";
                result += N.Value.ToString(aIndent, aPrefix + aIndent);
            }
            result += "\n" + aPrefix + "}";
            return result;
        }

        public override void Serialize(System.IO.BinaryWriter aWriter)
        {
            aWriter.Write((byte)JSONNodeType.Object);
            aWriter.Write(m_Dict.Count);
            foreach (string K in m_Dict.Keys)
            {
                aWriter.Write(K);
                m_Dict[K].Serialize(aWriter);
            }
        }
    }
    // End of JSONObject

    public class JSONString : JSONNode
    {
        private string m_Data;

        public override JSONNodeType Tag { get { return JSONNodeType.String; } }
        public override bool IsString { get { return true; } }

        public override string Value
        {
            get { return m_Data; }
            set
            {
                m_Data = value;
            }
        }

        public JSONString(string aData)
        {
            m_Data = aData;
        }

        public override string ToString()
        {
            return "\"" + Escape(m_Data) + "\"";
        }

        internal override string ToString(string aIndent, string aPrefix)
        {
            return "\"" + Escape(m_Data) + "\"";
        }

        public override void Serialize(System.IO.BinaryWriter aWriter)
        {
            aWriter.Write((byte)JSONNodeType.String);
            aWriter.Write(m_Data);
        }
    }
    // End of JSONString


    public class JSONNumber : JSONNode
    {
        private double m_Data;

        public override JSONNodeType Tag { get { return JSONNodeType.Number; } }
        public override bool IsNumber { get { return true; } }


        public override string Value
        {
            get { return m_Data.ToString(); }
            set
            {
                double v;
                if (double.TryParse(value, out v))
                    m_Data = v;
            }
        }

        public override double AsDouble
        {
            get { return m_Data; }
            set { m_Data = value; }
        }

        public JSONNumber(double aData)
        {
            m_Data = aData;
        }

        public JSONNumber(string aData)
        {
            Value = aData;
        }

        public override string ToString()
        {
            return m_Data.ToString();
        }

        internal override string ToString(string aIndent, string aPrefix)
        {
            return m_Data.ToString();
        }

        public override void Serialize(System.IO.BinaryWriter aWriter)
        {
            aWriter.Write((byte)JSONNodeType.Number);
            aWriter.Write(m_Data);
        }
    }
    // End of JSONNumber


    public class JSONBool : JSONNode
    {
        private bool m_Data;

        public override JSONNodeType Tag { get { return JSONNodeType.Boolean; } }
        public override bool IsBoolean { get { return true; } }


        public override string Value
        {
            get { return m_Data.ToString(); }
            set
            {
                bool v;
                if (bool.TryParse(value, out v))
                    m_Data = v;
            }
        }
        public override bool AsBool
        {
            get { return m_Data; }
            set { m_Data = value; }
        }

        public JSONBool(bool aData)
        {
            m_Data = aData;
        }

        public JSONBool(string aData)
        {
            Value = aData;
        }

        public override string ToString()
        {
            return (m_Data) ? "true" : "false";
        }

        internal override string ToString(string aIndent, string aPrefix)
        {
            return (m_Data) ? "true" : "false";
        }

        public override void Serialize(System.IO.BinaryWriter aWriter)
        {
            aWriter.Write((byte)JSONNodeType.Boolean);
            aWriter.Write(m_Data);
        }
    }
    // End of JSONBool


    public class JSONNull : JSONNode
    {

        public override JSONNodeType Tag { get { return JSONNodeType.NullValue; } }
        public override bool IsNull { get { return true; } }


        public override string Value
        {
            get { return "null"; }
            set { }
        }
        public override bool AsBool
        {
            get { return false; }
            set { }
        }

        public override string ToString()
        {
            return "null";
        }

        internal override string ToString(string aIndent, string aPrefix)
        {
            return "null";
        }

        public override bool Equals(object obj)
        {
            if (object.ReferenceEquals(this, obj))
                return true;
            return (obj is JSONNull);
        }
        public override int GetHashCode()
        {
            return base.GetHashCode();
        }

        public override void Serialize(System.IO.BinaryWriter aWriter)
        {
            aWriter.Write((byte)JSONNodeType.NullValue);
        }
    }
    // End of JSONNull

    internal class JSONLazyCreator : JSONNode
    {
        private JSONNode m_Node = null;
        private string m_Key = null;

        public override JSONNodeType Tag { get { return JSONNodeType.None; } }

        public JSONLazyCreator(JSONNode aNode)
        {
            m_Node = aNode;
            m_Key = null;
        }

        public JSONLazyCreator(JSONNode aNode, string aKey)
        {
            m_Node = aNode;
            m_Key = aKey;
        }

        private void Set(JSONNode aVal)
        {
            if (m_Key == null)
            {
                m_Node.Add(aVal);
            }
            else
            {
                m_Node.Add(m_Key, aVal);
            }
            m_Node = null; // Be GC friendly.
        }

        public override JSONNode this[int aIndex]
        {
            get
            {
                return new JSONLazyCreator(this);
            }
            set
            {
                var tmp = new JSONArray();
                tmp.Add(value);
                Set(tmp);
            }
        }

        public override JSONNode this[string aKey]
        {
            get
            {
                return new JSONLazyCreator(this, aKey);
            }
            set
            {
                var tmp = new JSONObject();
                tmp.Add(aKey, value);
                Set(tmp);
            }
        }

        public override void Add(JSONNode aItem)
        {
            var tmp = new JSONArray();
            tmp.Add(aItem);
            Set(tmp);
        }

        public override void Add(string aKey, JSONNode aItem)
        {
            var tmp = new JSONObject();
            tmp.Add(aKey, aItem);
            Set(tmp);
        }

        public static bool operator ==(JSONLazyCreator a, object b)
        {
            if (b == null)
                return true;
            return System.Object.ReferenceEquals(a, b);
        }

        public static bool operator !=(JSONLazyCreator a, object b)
        {
            return !(a == b);
        }

        public override bool Equals(object obj)
        {
            if (obj == null)
                return true;
            return System.Object.ReferenceEquals(this, obj);
        }

        public override int GetHashCode()
        {
            return base.GetHashCode();
        }

        public override string ToString()
        {
            return "";
        }

        internal override string ToString(string aIndent, string aPrefix)
        {
            return "";
        }

        public override int AsInt
        {
            get
            {
                JSONNumber tmp = new JSONNumber(0);
                Set(tmp);
                return 0;
            }
            set
            {
                JSONNumber tmp = new JSONNumber(value);
                Set(tmp);
            }
        }

        public override float AsFloat
        {
            get
            {
                JSONNumber tmp = new JSONNumber(0.0f);
                Set(tmp);
                return 0.0f;
            }
            set
            {
                JSONNumber tmp = new JSONNumber(value);
                Set(tmp);
            }
        }

        public override double AsDouble
        {
            get
            {
                JSONNumber tmp = new JSONNumber(0.0);
                Set(tmp);
                return 0.0;
            }
            set
            {
                JSONNumber tmp = new JSONNumber(value);
                Set(tmp);
            }
        }

        public override bool AsBool
        {
            get
            {
                JSONBool tmp = new JSONBool(false);
                Set(tmp);
                return false;
            }
            set
            {
                JSONBool tmp = new JSONBool(value);
                Set(tmp);
            }
        }

        public override JSONArray AsArray
        {
            get
            {
                JSONArray tmp = new JSONArray();
                Set(tmp);
                return tmp;
            }
        }

        public override JSONObject AsObject
        {
            get
            {
                JSONObject tmp = new JSONObject();
                Set(tmp);
                return tmp;
            }
        }
    }
    // End of JSONLazyCreator

    public static class JSON
    {
        public static JSONNode Parse(string aJSON)
        {
            return JSONNode.Parse(aJSON);
        }
    }
}